[boost] Multisignature function v1.2.2

From: Marco Costalba (mcostalba_at_[hidden])
Date: 2008-06-08 03:02:02

Hi all,

   I have upload in Vault the file msf-1.2.2.zip with a new version of
multi signature boost::function extension

New in this version is a workaround for a rare compile error in MSVC
due to a bug in the compiler that requires a using::operator()
declaration also in a class where there are no other operator()
defined !

I have also added in the examples a runtime object factory, i.e. where
the key to query the factory for an object of a chosen class is a
runtime variable, not a compile time constant or something similar.
Factory allows to pass any number and type of arguments to ctor of the
chosen class.

Functionality is similar to factory_24_2_08.zip already in Vault, but
this time I've used all the arsenal of boost, namely: fusion, switch
(in sandbox, the Vault version is broken), mpl and of course the multi
signature function (MSF) that is the core of the factory. Due to this
I think the implementation is the most minimal, clean and simple that
I know.

A peculiarity of this implementation is that MSF uses its polymorphic
function object support to bind c'tors wrappers in a naturally and
very clean way. This is a good example of how it is possible to take
advantage of polymorphic function support in real code.

Thanks
Marco